[igt-dev] [RFC PATCH v10 3/6] lib/igt_gt: use for_each_engine2 to loop through engines

[Tvrtko Ursulin]

On 05/03/2019 13:16, Andi Shyti wrote:
> 'for_each_engine2()' defines a loop through the gpu engines.
> 
> It can work with both active and pre-defined engines.
> 
> In case we are looping through active engines (i.e. the running
> kernel has the query and get/setparam ioctls), the
> intel_active_engines2 points to an array that contains only the
> list engines dynamically allocated after having interrogated the
> driver.
> 
> While, if we are looping through pre-defined engines,
> intel_active_engines2 points to the 'intel_execution_engines2'
> array and works exactly as for_each_engine() but using the
> new 'struct intel_execution_engine2' data type.
> 
> Signed-off-by: Andi Shyti <andi.shyti at intel.com>
> ---
>   lib/igt_gt.h | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/lib/igt_gt.h b/lib/igt_gt.h
> index f4bd6c22a81a..f8bdaa62899f 100644
> --- a/lib/igt_gt.h
> +++ b/lib/igt_gt.h
> @@ -30,6 +30,8 @@
>   
>   #include "i915_drm.h"
>   
> +#include "i915/gem_engine_topology.h"
> +
>   void igt_require_hang_ring(int fd, int ring);
>   
>   typedef struct igt_hang {
> @@ -86,6 +88,12 @@ extern const struct intel_execution_engine {
>   	     e__++) \
>   		for_if (gem_ring_has_physical_engine(fd__, flags__ = e__->exec_id | e__->flags))
>   
> +#define for_each_engine2(fd, ctx) \
> +		for (struct intel_execution_engine2 *e2__ = \
> +		     gem_set_context_get_engines(fd, ctx); e2__->name; e2__++) \
> +			for_if (gem_has_engine_topology() || \
> +				gem_has_engine(fd, e2__->class, e2__->instance))
> +
>   bool gem_ring_is_physical_engine(int fd, unsigned int ring);
>   bool gem_ring_has_physical_engine(int fd, unsigned int ring);
>   
> 

Btw maybe you can just replace existing for_each_engine_class_instance 
with new code. Only one test uses it at the moment so it should be 
manageable.

(The double underscore version you leave to always work off the static 
list for test enumeration.)

Regards,

Tvrtko